…………………………………………….not really sure about the last question
Answer:
<h2>20</h2>
Step-by-step explanation:

Y=-1/2x+2/3 for m=-1/2 and b=2/3
Joel read the greatest number of pages in a day.
Armando read (46×.15) 6.9 pages.
Billy read (72×.11) 7.92 pages.
Robert read (68×.12) 8.16 pages.
Joel read (69×.14) 9.66 pages.